VPY-0033
QUESTION
Second messenger formed during the protein hormone action on target is?
OPTIONS
(A) Ca++
(B) cAMP
(C) Phosphodiesterase
(D) Phospholipase
ANSWER
(B) cAMP
EXPLANATION
cAMP is the correct option because many protein hormones activate membrane receptors coupled to G proteins, leading to adenylyl cyclase activation and formation of cyclic AMP as a second messenger. Ca2+ can also act as a second messenger in other pathways, but phosphodiesterase breaks down cAMP and phospholipase is an enzyme rather than the second messenger itself.
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